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8.3 Setting preset boiler temperature
Preset boiler temperature, just like the
preset mixer circuit temperature, can be set
in the menu (possible settings of these
temperatures are limited by the scope of
their corresponding regulator service
parameters).
Boiler settings > Preset boiler temp.
Mixer 1 settings > Preset mixer temp.
Mixer 2 settings > Preset mixer temp.
Mixer 3 settings > Preset mixer temp.
Mixer 4 settings > Preset mixer temp.
The value set as Preset boiler temp. is
ignored by the regulator if the preset boiler
temperature is controlled by weather sensor.
Regardless of that, the preset boiler
temperature is automatically increased in
order to fill the hot utility water tank and
feed heating mixer cycles.
8.4 FIRING-UP
FIRING-UP mode is used to automatic firing
up of boiler furnace. Total time of firing-up
depends on the regulator settings (feeder
operation time, heater operation time, etc.)
and on the boiler conditions before firing up.
All parameters, which affect firing-up process
are grouped in the menu:
SERVICE SETTINGS >BOILER SETTINGS
Detailed description of firing-up cycle:
Fan turns on with the power set in the
parameter of Blowing power- firing up,
Small dose of fuel (approx.20% basic dose)
is supplied,
Conditions of the furnace are checked – i.e.
once the exhaust temperature has reached
the value of Ex. temp. at the end of firing-
up or has increased by Ex.temp.delta
within the time set in the parameter
Ignition test time elapsed from the fan
start, firing-up process stops. It means
firing-up has been detected and regulator
enters OPERATION mode. In case the
criteria of furnace firing-up have not been
fulfilled, regulator attempts to clean the
furnace and fire it up:
poker is activated to operate over Poker
cycle time ,
fuel is supplied over Feeding time,
fan turns on with the power set in the
parameter of Blowing power- firing up,
lighter switches on for Firing-up time. The
regulator checks within this time whether
fuel in the burner has been kindled. Fuel is
deemed kindled once the temperature
increment indicated on exhaust
temperature sensor has reached the value
of Ex.temp.delta or the exhaust
temperature has increased above the value
set in Ex. temp. at the end of firing-up. If
firing-up has been successfully completed,
lighter turns off and regulator enters
OPERATION mode,
Just upon entry the OPERATION mode,
regulator checks whether the exhaust
temperature has increased by the value of
Ex.temp.delta 2. If NOT- regulator returns
to firing-up mode. If YES- it remains in
OPERATION mode.
In case the firing up has not been
successfully completed, further attempts to
fire-up the furnace are carried out with fuel
dose (Feeding time) reduced to 10% of the
dose used in first attempt.
Upon execution of three unsuccessful
attempts, the alarm of Unsuccessful boiler
firing-up attempt is produced. Boiler
operation is interrupted and cannot be
automatically resumed - operator's
intervention is required. Once the causes of
firing-up failure have been removed, re-start
the boiler.
8.5 OPERATION MODE
In this mode the boiler runs automatically
according Individual Fuzzy Logic or
STANDARD algorithm. Fan operates
continuously, which is shown on Fig. 3. Fuel
feeder switches on periodically
Fig. 3 Fan and feeder operation cycles.
The operation cycle is composed of feeder
operation time (feeding time) and feeder
standstill time (feeder interval). Power of the
fan and the feeding time are determined by
either regulation algorithm described below.
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